border-radius

percentage-based units for border radius refer to the width and height of the border box. 百分比单位参考的是宽度和高度的值

100% causes the corners to overlap and then the browser has to proportionally reduce them back down until they do not overlap anymore which brings them back to 50%.

制作圆还是要使用50%的

Border-radius: 50% vs 100% Why border radius of 100% and not border radius of 50%?

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